Based on your avatar and that you're not going to "Bin it" makes me think you are in England?
If so I'm wondering if that unit was specific to the Euro and or British market
I might add there is a dedicated Kenwood sub forum here at AK and seeing as you thread title make no mention of Kenwood you might want to try there with a new thread.
https://www.audiokarma.org/forums/index.php?forums/kenwood-trio-kensonic-accuphase.168/
Sansui used the same bulbs in a few units. The rubber/bulb comes off the pins, then you can remove the bulbs by fishing the leads out of the pin holes. They are just a friction fit. Depending on the voltage, I use wedge LEDs, remove the base by bending the leads, then insert them into the rubber holder like the original bulbs, and viola!I tried the tuner and it works. I noticed part of the panel wasnt lighting up, checked and some globes are blown, strangest globes I ever did see mounted in these rubber boot things.View attachment 2112421